Engine rpm sensor
Function
informs crankshaft position and speed to the Mar-
elli control unit
Operation / operating principle
inductive sensor: sinusoidal-type generated volt-
age; two teeth are missing on the flywheel for the
reference position
Level in wiring diagram:
Engine speed sensor
Location:
•
on the vehicle: on the clutch cover
•
connector: under the tank on the right
(3-ways black connector)
Electrical characteristics:
0.79 kohm at ambient temperature
Pin out:
1. negative signal
2. positive signal
3. shielding with ground connection
DIAGNOSIS INSTRUMENT: PARAMETERS
Engine rpm: rpm
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING,
CAREFULLY READ THE GENERAL TROUBLESHOOTING
CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGIN-
NING OF THE CHECK AND CONTROL SECTION IN THE
ELECTRICAL SYSTEM CHAPTER.
DIAGNOSIS INSTRUMENT: STATUSES
Synchronised panel
•
No_under analysis_standby_Yes
DIAGNOSIS INSTRUMENT: ELECTRICAL ERRORS
CAUTION
IF THE ELECTRIC CIRCUIT IS INTERRUPTED OR SHORT-CIRCUITED, NO ERROR IS DIS-
PLAYED. CHECK THE ENGINE SPEED SENSOR CONNECTOR AND THE MARELLI CONTROL
UNIT CONNECTOR: IF NOT OK, RESTORE; IF OK, CHECK THE CORRECT ELECTRIC CHAR-
ACTERISTICS OF THE SENSOR: IF NOT OK, REPLACE THE SENSOR. IF OK, CHECK THAT
THERE IS CONTINUITY ON BOTH CABLES, SUPPLY INSULATION AND GROUND INSULATION.
CARRY OUT THE TESTS FROM THE SENSOR CONNECTOR TO THE SENSOR. IF NOT OK, RE-
STORE THE CABLE HARNESS/REPLACE THE SENSOR. IF OK, PERFORM THE TEST FROM PIN
9 AND 23 OF THE MARELLI CONTROL UNIT ENGINE CONNECTOR.
DIAGNOSIS INSTRUMENT: LOGIC ERRORS
Electrical system RSV4 R
ELE SYS - 154
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